Lua error, usually pvp related

[knasen88]

1075x Aptechka/frame.lua:2444: attempt to perform arithmetic on field 'expirationTime' (a nil value)
[string "@Aptechka/frame.lua"]:2444: in function <Aptechka/frame.lua:2443>

Locals:
self = Frame {
 0 = <userdata>
 StartTrace = <function> defined @Aptechka/frame.lua:796
 text = FontString {
 }
 SetJob = <function> defined @Aptechka/frame.lua:2470
 currentJob = <table> {
 }
 blink = AnimationGroup {
 }
 prefix = "Fear "
 bg = Texture {
 }
}
time = 0.005000
(*temporary) = nil
(*temporary) = 1571293.949000
(*temporary) = 1571293.949000
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to perform arithmetic on field 'expirationTime' (a nil value)"
string_format = <function> defined =[C]:-1

I get this sometimes, mostly when pvping. Seems to be Fear related?